Sheet scanner



FIG. 1 is a front perspective view of an embodiment of a sheet scanner in accordance with our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right-side elevational view thereof; and,

FIG. 7 is a left-side elevational view thereof.

The portions shown in broken line are not claimed. 

The ornamental design for a sheet scanner, as shown and described. 